At AvnWx.com, we're pilots, too. We strive for accurate, real-time data, because no one cares about yesterday's weather. Also, because we'd rather be flying we don't want to have hard-coded data which forces us to manually update this site to keep it accurate.
However, you agree to use this website for information only. You must contact an official Weather Briefer prior to flight to make sure you have the latest weather and NOTAMs. AvnWx.com cannot guarantee fully accurate delivery of complete briefing information.
| Source | AvnWx.com Coverage | Update Frequency of Source | Update Frequency of AvnWx.com | |
| METAR | NOAA/ADDS | World-wide, Military bases included | Hourly, but can be revised anytime. Warning symbol,  is displayed with details, if station's data more than 90 minutes old. | 5 minutes |
| PIREP | NOAA/ADDS | World-wide | When reported by pilots | 5 minutes |
| TAF | NOAA/ADDS | World-wide, Military bases included | Typically issued for 24-hour period, four times daily, updated as required. Warning symbol, is displayed with details, if station's data more than 12 hours old. | 10 minutes |
| AIRMET | NOAA/ADDS | US only | Issued every 6 hours, covers 6 hour forecast period, updated as required | 10 minutes |
| SIGMET | NOAA/ADDS | US only | Unscheduled, updated as required | 10 minutes |
| Winds Aloft | NOAA | CONUS and Alaska | Issued every 6 hours | 30 minutes |
| TFR | FAA | US | Unscheduled. If the FAA reporting site is down, AvnWx.com shows most recent data and displays warning symbol in Control Panel. | 15 minutes |
| Stadium TFR | FAA (TFR) Major League Baseball (Schedule) National Football League (Schedule) Major Motor Speedway races NCAA Football (Schedule) | US and Canada | N/A | nightly |
| NEXRAD Precipitation Radar | IEM | CONUS | Approx. 5 minutes | 5 minutes. Animation supports previous 45 minutes, in 5 minute increments |
| Airport Facilities Directory | FAA | US | 56 days | nightly |
These are obtained directly from the Aviation Digital Data Server (ADDS), part of the NOAA's National Weather Service. This data (i.e., the raw METARs, PIREPs, advisories and TAFs) is not subject to copyright protection. The presentation and translation of the raw data is provided and copyrighted by AvnWx.com. Because of the experimental nature of the ADDS service, AvnWx.com cannot full-time guarantee access to the information, and should not be relied upon in lieu of officially disseminated weather forecasts and warnings.
AvnWx.com obtains updates every few minutes. You can see the time of the most recent update in to Control Panel. At time of the update, we have the most recently available data. You're seeing the most recent information available from ADDS.
See also AvnWx.com -- About Pilot Reports
Special handling is performed for the Stadium TFR. Using published schedules for Major League Baseball and National Football League AvnWx.com displays TFR areas for upcoming games. Note that the TFR applies to "one hour before to one hour after" the game. Games are estimated to last three hours, but AvnWx.com has no way of determining the precise end of a game. Major Motor Speedway events are handled in a similar manner.
Pages from the A/FD are obtained directly from the FAA. Since these are updated every 56 days, AvnWx.com gets the update also. You can check the the currency of the entry by looking at the date on the bottom of each page of the A/FD.
This overlay is the NEXRAD Base Reflectivity, provided by IEM. The data is gathered by IEM and regenerated every 5 minutes. Though it is updated every 5 minutes, the base radar images are not all updated every five minutes and therefore the resulting composite may not be fully updated every 5 minutes. Use this image as merely a guide current precipitation. Tuning on animation using the control panel, will show the previous 45 minutes of radar images. This is useful to see direction of weather and trends. It also helps when there appears to be a missing radar echo. Note that echos change rapidly, so use echos for general planning only. Avoid thunderstorms by at least 20 miles, and recall that cumulonimbus can grow in less than one hour.